/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.apache.pig.pigpen.actions;

import org.apache.pig.pigpen.LoggerUtil;
import org.apache.pig.pigpen.view.LaunchWindowView;
import org.eclipse.core.resources.IFile;
import org.eclipse.jface.action.IAction;
import org.eclipse.jface.viewers.ISelection;
import org.eclipse.ui.IObjectActionDelegate;
import org.eclipse.ui.IViewReference;
import org.eclipse.ui.IWorkbenchPage;
import org.eclipse.ui.IWorkbenchPart;
import org.eclipse.ui.PartInitException;
import org.eclipse.ui.PlatformUI;

public class LaunchActionDelegate implements IObjectActionDelegate {

    private ISelection selection;

    public LaunchActionDelegate() {
    }

    public void setActivePart(IAction action, IWorkbenchPart targetPart) {
    }

    public void run(IAction action) {

        IWorkbenchPage page = PlatformUI.getWorkbench()
                .getActiveWorkbenchWindow().getActivePage();

        // figure out what file is selected
        IFile file = ActionDelegateHelper.GetSelectedFile(selection);
        if (file == null)
            return;

        // see if there's a pre-existing view instance for this file
        IViewReference viewRef = ActionDelegateHelper.GetLauncherReference(
                page, file, null);
        boolean viewInstanceAlreadyExisted = (viewRef != null);

        // create a new instance of the launch view
        try {
            ActionDelegateHelper.ShowLauncher(page, file, null);
        } catch (PartInitException e) {
            LoggerUtil.logError("Error creating launch window", e);
        }

        // tell the view to go ahead and launch the file
        viewRef = ActionDelegateHelper.GetLauncherReference(page, file, null);
        if (!viewInstanceAlreadyExisted && viewRef != null) {
            LaunchWindowView view = (LaunchWindowView) viewRef.getView(false);
            view.launch(file);
        }
    }

    public void selectionChanged(IAction action, ISelection selection) {
        this.selection = selection;
    }

}
